22 June 2004 On estimation of secret message length in LSB steganography in spatial domain
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Abstract
In this paper, we present a new method for estimating the secret message length of bit-streams embedded using the Least Significant Bit embedding (LSB) at random pixel positions. We introduce the concept of a weighted stego image and then formulate the problem of determining the unknown message length as a simple optimization problem. The methodology is further refined to obtain more stable and accurate results for a wide spectrum of natural images. One of the advantages of the new method is its modular structure and a clean mathematical derivation that enables elegant estimator accuracy analysis using statistical image models.
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Jessica Fridrich, Miroslav Goljan, "On estimation of secret message length in LSB steganography in spatial domain", Proc. SPIE 5306, Security, Steganography, and Watermarking of Multimedia Contents VI, (22 June 2004); doi: 10.1117/12.521350; https://doi.org/10.1117/12.521350
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